The Print Has Many Unexplained Seemingly Random Errors - Printronix L1024 Maintenance Manual

d. The transfer charger is not moving freely and must be replaced.
554. The charge on the transfer corona is not at the proper voltage.
a. Make sure the contact between the H.V.P.S. and the transfer corona is good.
b. Check the charge from the H.V.P.S., and adjust the power supply if the charge is not
correct. Follow the adjustment procedure in Chapter 8, Power Supplies .
c. If the charge is still not correct after step b, replace the H.V.P.S.
555. The developer sleeve is not receiving the correct voltage.
a. The contact between the developer sleeve and the contact spring from the H.V.P.S. is
faulty. Check for corrosion and a compressed spring. The contact may also be faulty
inside the developer unit itself. Replace developer unit if the problem cannot be
corrected.
b. The H.V.P.S. is not supplying the correct voltage. Adjust according to the procedure in
Chapter 8, Power Supplies .
c. Replace the H.V.P.S. if the correct voltage cannot be obtained.
556. The OPC drum is not properly grounded and the charge is not being dissipated by the
laser.
a. Check the OPC drum grounding spring for proper contact with the OPC drum shaft.
Replace the spring if it is severely bent.
b. The OPC drum is defective and should be replaced.
560. The print has many unexplained, seemingly random errors.
561. The contact to the charge grid is poor, resulting in an uneven charge on the OPC drum.
a. Replace the OPC drum unit.
b. Clean and/or lengthen the spring on the H.V.P.S. contact.
c. Check and replace the H.V.P.S. if needed.
570. The print has a dirty background accompanied by a ghost image.
571. The contact to the developer sleeve is poor, resulting in an incorrect developer bias.
a. Check the contact spring. Lengthen it if needed by pulling upward.
b. Replace the developer unit.
Chapter 13 – Troubleshooting Guide
A. If the solenoid still does not function after replacing the L.V.P.S., replace the
Engine Controller Board.
1. Clean toner or paper dust from the transfer corona contact and the H.V.P.S.
spring.
2. Clean off any corrosion on the transfer corona contact.
3. If the spring for the H.V.P.S. contact is compressed, lengthen it by pulling the
top of it. This helps ensure the electrical contact. Make sure to pull the spring
upward, not at an angle.
13–21